A pair of battery backup like accessories is available. The first, LSI00279 is a true battery backup for the 9270, 9271 and 9286 Series.
CacheVault is an accessory kit for the 9271-4i and -8i. The system uses NAND flash to retain the data in the DRAM buffer. A capacitor provides enough power to move the data from DRAM to NAND flash.
We find the CacheVault kit impressive and see it as a much better option than the ages old BBU strategy.
LSI has more information about CacheVault in this video above.